Grimm's Concave finds ConvexTricky building game in which the matching two parts are to be found. As a tactile variation, put the pieces in a bag and find the matching parts through the sense of touch. The individual parts have interesting and unusual shapes so they are also ideal for outdoor play and imaginative building. 4 parts, L = 6 12 cm, H = 2. 5 cm, lime wood, non toxic water based color stain recommendation age: 4+ WARNING: CHOKING HAZARD Small parts. Not for children